Simple Machines Flashcards
What’s in the middle of a second-class lever
Load
What is in the middle of a first class lever
The fulcrum
In the middle of the third class lever
Effort
What do Simple machines do
Make work either easier or faster
What do Rollers do
Make it easier to move heavy things by reducing friction
What is an inclined plane
It is a sloping surface that uses less work over a longer distance. And is easier than lifting the object
What Is a wedge
An inclined plane that moves. Thick at one end and skinny at the other. It can lift or split something apart.
What is a screw
The screw is an inclined plane wrapped around a shaft that can fasten things together
What is a wheel and axle
It’s a type of lever the wheel turns around small cylinder called an axle the wheel and axle can help us lift and move heavy loads the wheels reduce friction so things can move easier
What is a pulley
A wheel with A groove in it where a belt or rope moves
What is friction
A force that resists motion between two objects that touch. There’s more friction between rough things than smooth things
What is effort
The force that produces movement
What Is a load
The Object being moved
Is a gear
A wheel with teeth
What is a fixed pulley
A fixed pulley uses one rope and one pulley
What is a movable pulley
A movable pulley includes 2 or more pulleys and ropes and reduces the force needed by half
Name 5 examples of a first class lever
Paint can opener, shovel, scissors, bottle opener, and a dolly
Name 3 examples of a second class lever
Nut opener, wheel barrow, and a dolly
Name 3 examples of a third class lever
A hockey stick, baseball bat, and a fishing rod
What’s the advantage of a chain drive
Less slippage
What is a block and tackle
A fixed pulley and a movable pulley linked together by ropes
Name 5 examples of a fixed pulley
Clothes line, flag pole, window blinds, wheel and rope, and a wishing pulley
Name two belt drive systems and how to the driver and follower move
Crossed belt makes them move in opposite directions
Regular belt makes them move the same way
How do gears move on wheel on wheel contact?
What if there’s an idler
No idler they move in opposite directions
1 idler in the middle makes the wheels turn in the same direction
How do gear on a bike work?
Which do you use to go uphill and downhill
2 gears are attached by a chain and so the pedal is the lever turning the pedals drives the chain
Uphill: lower gear you have to pedal more to make it easier to go uphill
Downhill: higher gear you pedal less and the wheel turns more
What happens if you add more pulleys to help lift something
The effort is cut in half making it easier
What is a compound machine
Give two examples
Two or more simple machines joined together
Bike(levers, gears, wheel and axle)
Can opener( lever, gear)
Name 6 simple machines and give examples
Levers 1st teeter totter, 2nd nut opener,3rd fishing rod, Wheel and axle, door nob, Ferris wheel Inclined plane, wheel chair ramp Wedge, knife, door stopper Screw, screw Pulleys and gears, clothes line, bike
